Paving-flag.



UNITED STATES PATENT it OE ICE.

J OSEF STEINBAOH, OF VIENNA, AUSTRIA-HUNGARY.

PAVlNG-FLAGQ SPECIFICATION forming part of Letters Patent No. 698,072,dated April 22, 1902.

Application filed October 1, 1900. Renewed $eptomber 27, 1901- SerialNo- 76,804. (No model.)

T at whom it may concern:

Be it known that LJOSEF STEINBAOH,a subject of the Emperor ofAustria-Hungary,and a resident of Vienna, Austria-Hungary, have inventedcertain new and useful Improvements in Paving-Flags, of which thefollowing is a specification.

The object of this present invention is to provide improved paving-flags forroads, footpaths, and the like.

In accordance with my invention the improved flags are formed of a layerof concrete upon which is spread a layer composed of a mixture ofpulverized asphalt, sulfur,

. thermore, be yieldingly embedded in the as lime, iron oxid, andgranula tedporphyry-or any other kind of hard homogeneous stone, saidsecond layer forming a solid inseparable mass with the layer ofconcrete.

Experiments have shown that the so-called noiseless pavements made ofrolled asphalt or asphalt flags present numerous defects,

due chiefly to the fact that the layer of as phalt is not firmlyconnected with the lower supporting layer of concrete. These objectionsare partially overcome by employing flags composed of a layerf ofconcrete and a layer of asphalt. Pavements, however, made with'suchflags present the defect that. they become very slippery when it rainsand are quickly worn out. The pavement made by means of my improvedflags is not so quickly worn out, since porphyry'or otherhardhomogeneous stone is very resisting and can, furthe invention isthat the as hard as desired. i

The process of manufacturing the improved flags is as follows: Naturalasphalt- .meal is mixed in a cold state with finely-diground.

Havingfullydescribed myinventiomwhat to secure by Letters Pat-ysubstantially as set forth.

vided sulfur, iron oxid, cork-meal, and-granulated porphyry or anysimilar hard stone. This mixture is slowly heated in a suitablereceptacle to a temperature of 140 Celsius, care being taken tocontinually stir the ma terials. Then the heated mixture" is maintainedfor a certain time atatempe'rature of 120 and poured into suitable moldscontaining a layer of concrete still moist. Then the flag is submittedto a strong pressure, which determines the degree of hardness of theflag.

Experiments have proved that a perfect product is obtained when thematerials are employed in about the following proportions: first, onethousand kilograms asphalt-meal; second, fifteen to, twenty kilogramssulfur; third, one hundred and fifty kilograms porphyry or any similarstone; fourth,'five.kilograms cork-meal; fifth, ten kilograms iron oxid.Four and five, or one of thesematerials, may be omitted withoutaffecting the final product. Theflags thus produced and which have," forinstance, for cart-roadsa total thickness of from six to sevencentimeters, the layer of porphyry, cork, and asphalt being from two tothree centimeters thick, are laid upon the dry bed of concrete on theroad with ordinary hydraulic lime, the joints between the flags beingclosed'bymeans of hot asphalt-powder. [For foot-pavements l preferablyemploy flags of a thickness offour-to five centimeters, the layer ofporphyry, cork,-

and asphalt being one and one-half to two cen timeters thick. For thesepavements the flags may be directly I claim, and desire ent, is

placed upon well-rammed a 1. Paving-flags, composed of alayer of con-.

crete firmly connected by means of a strong pressure with an upperlayer'formedofl'a mix ture .of natural asphalt-meal, sulfur, cork meal,iron oxid and granulated porphyry or any other kindvof hardhomogeneous'stone,

2. The process of making the improved paving-flags, which-consists inmixing natural asphalt-meal in a cold state with finely- V dividedsu1fur,cork-meal iron oxid and gran'uabove materials being employed inabout the lated porphyry or other similar stone, heatproportions stated,substantially as set forth. :0

ing the mixture to a temperature of 140 Cel- In testimony whereof I havehereunto set sius, maintaining the mixture at a temperamy hand inpresence of two witnesses.

5 ture of 120 Celsius, then pouring the mate- JOSEF STEINBACII.

rial into suitable molds containing a layer of Witnesses: moistenedconcrete, and finally submitting ALVESTO S. HOGUE,

the molded flags to a strong pressure, the J. E. GILLON.

